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Date: Fri, 29 Jul 2011 11:26:02 +0200
From: Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
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Subject: Re: Slow performance Win7/64
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On Jul 29 08:43, Heiko Elger wrote:
> Hello jojelino,
> 
> I just rebuild cygwin1.dll latest snapshot. 
> 
> > I believe the attached patch workarounds delayed wait_sig problem.
> Yes - it works fine!
> 
> > This yielded speed improvement. i ran your testcase and same timestamp 
> > recorded 35. approx 2x speed.
> 
>                                       XP/32              Win7/64
> cygwin snapshot 2011-07-21              34                  12
> cygwin snapshot 2011-07-21 SIGPATCH     44                  37
> 
> As you see XP and Win7 now a really faster.
> Win7 3x speed - wow.
> 
> > but i can't make sure it doesn't include side-effects. please test it on 
> > your pc. let's hope it would work.
> I will test ist.
> 
> I've already recognize one positive side effect:
> The CTRL-C Handler works now even faster.
> With unpatched cygwin1.dll there was a realy long delay, after pressing CTRL-C.
> Can you agree this too?
> 
> I'm very interested if this patch will be released or not.
> I'm interested in the opionion opinion of C. Vinschen and C Faylor.

Me too :)

The slowdown of the code was the result of a patch which was supposed
to fix a potential race condition.  Jojelino's patch looks nice, but
it might reintroduce a new race.  Handle with care.


Corinna

-- 
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Project Co-Leader          cygwin AT cygwin DOT com
Red Hat

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